//拼接缓冲区
var buf = Buffer.from('世上无难事，')
var buf1 = new Buffer.from(new String('只怕有心人'));
//执行拼接操作
var buf2 = Buffer.concat([buf, buf1]);
//输出拼接后缓冲区的内容
console.log("buf2 内容: " + buf2.toString());